Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in /home/alterna/private_assets.alternalab.it/database/migrations/2019_02_21_224703_make_fields_nullable_for_integrity.php:7 Stack trace: #0 {main} thrown in /home/alterna/private_assets.alternalab.it/database/migrations/2019_02_21_224703_make_fields_nullable_for_integrity.php on line 7